I would suggest supplying a real oscilloscope capture covering multiple cycles, together with some other signals in the same capture, like the Chip Selects.

> See Appendix,Describedin the referencemanual

I can't find any Appendix in my MCF5118 Reference Manual. There's Chapter 45 and then the last page. You should give exact details on what diagram in which chapter of what manual you're reading.

You should be looking at "Figure 20-8. Basic Read-Bus Cycle" and the following diagrams. Better, for timing information you should not read the Reference Manual, but should refer to "Figure 11. FlexBus read timing" in "4.10 FlexBus timing specifications" in the Data Sheet.

For back-to-back Read Cycles on the Flexbus I would expect to see ALE go Active/High during the S0 clock period (when CS is Inactive/High) and then go Inactive/Low during the rest of the clock cycles, while CS is Active/Low.

In that sens the ALO and CS signals are similar, and I think you're misinterpreting the High and Low parts.

I would suggest supplying a real oscilloscope capture covering multiple cycles, together with some other signals in the same capture, like the Chip Selects.

> See Appendix,Describedin the referencemanual

I can't find any Appendix in my MCF5118 Reference Manual. There's Chapter 45 and then the last page. You should give exact details on what diagram in which chapter of what manual you're reading.

You should be looking at "Figure 20-8. Basic Read-Bus Cycle" and the following diagrams. Better, for timing information you should not read the Reference Manual, but should refer to "Figure 11. FlexBus read timing" in "4.10 FlexBus timing specifications" in the Data Sheet.

For back-to-back Read Cycles on the Flexbus I would expect to see ALE go Active/High during the S0 clock period (when CS is Inactive/High) and then go Inactive/Low during the rest of the clock cycles, while CS is Active/Low.

In that sens the ALO and CS signals are similar, and I think you're misinterpreting the High and Low parts.

Thank you for youranswer, depending on yourtips,I removedwait States,testedonce again , I waswrongbefore the test,did not observethe detailsFB_ALEsignals, thesignals are as follows.In other words,my previousconfiguration of FLEXBUS is correct.